Reamer



March 11, 1941.

D. D. ANDERSON REAMER Filed Feb. 1, 1940 Patented Mar. 11, 1941 PATENT OFFICE EEAMER Dwight D. Anderson,

Houston, Tex., assignor to Reed Roller Bit Company, Houston, Tex., a corporation of Texas Application February 1, 1940, Serial No. 316,731

6 Claims.

This invention relates to reamers for use in connection with the drilling of wells. It has for its general object the provision of a structure whereby a reamer cutter of the roller type may be firmly and rigidly, yet replaceably, mounted within a cutter recess in a reamer body.

In mounting reamer cutters within their recesses, it is necessary that they be mounted as firmly as possible and that there be no possibility of play between any of the parts constituting the mounting during the operation of the reamer.

It is, therefore, an object of this invention to provide a structure for mounting a reamer cutin the side of the reamer body in to give the greatest possible degree of rigidity to the mounting, prevent any play or lost motion between the parts of the mounting during operation, and at the same time utilize the smallest possible number of parts and eliminate any parts which might easily be broken or distorted.

It is a further object to provide a mounting in which the mounting parts are constantly urged into tighter locking engagement with the head and with the cutter shaft.

It is a further object to provide a structure which may be readily removed and replaced by unskilled labor without necessity for any factory operations or for any fine adjustments and without necessity for any special tools.

Other objects and advantages will become apparent from the following description, taken in connection with the accompanying drawing, it being understood that the same are by way of illustration and example only.

In the drawing:

Figure 1 is a side elevation of a reamer body constructed in accordance with this invention showing the reamer cutters in place therein;

Figure 2 is a vertical cross section through one wall of the reamer body illustrated in Figure 1 and through one of the cutters mounted therein, the same being taken along the line 2--2 of Figure 1;

Figure 3 is a horizontal cross section taken along the line 33 of Figure 1; and

Figure 4 is a vertical sectional view of the split bushing member employed in each of the mounting blocks.

In accordance with this invention, a reamer body I is formed with a major recess 2 and with a pair of auxiliary or minor recesses 3 and 4, respectively, at opposite ends of and in communication with the major recess. Disposed ter in a recess such a manner as within the major recess is the reamer cutter 5, the same being rotatably mounted upon a cutter shaft or pin 6, said cutter shaft being provided with threaded extremities I and 8.

Blocks l0 and respective minor or auxiliary recesses 3 and 4, preferably by welding the same to the reamer body as shown at 12. In Figure 3 it will be seen that each block conforms to the cross-sectional dimensions of the auxiliary that after welding, each block is fixedly and. firmly held therein. Each of the blocks l0 and H are provided with openings l3 and 14, said openings extending through the blocks and be- H are fixedly secured into their [ll recess and 10 ing circular and tapering toward a smaller (31- 15 mension in a direction toward said major recess. These openings are larger than is the diameter of the cutter shaft or pin. However, a split bushing, shown at IS in Figure 4, is fitted into each of the openings ing being correspondingly tapered to conform to the tapered inner walls of the blocks I0 and The bushing I5 is split longitudinally along the edges l6, l6 and tapered along the outer surfaces I1, I'l.

an opening H3, or rather half openings, through which extends the threaded extremity of each end of the cutter shaft or pin.

It will be seen from the foregoing that, in mounting the cutter or reamer in the major recess, the blocks are first secured in position in the auxiliary recesses and the cutter shaft with the cutter thereon is then inserted into the openings in first one of the blocks and then the other. In this operation it will be seen that one end of the shaft may be inserted into its block beyond its normal position, and then the other end inserted and the shaft moved back to its normal position. Thereupon the split l3 and I4, said split bush- 20 The bushing is provided with 25 bushings are inserted in the openings in the 40 blocks and around the extremities of the cutter shaft or pin. Nuts 20 are then threaded upon the extremities of the shaft and tightened whereupon the split bushings will be moved toward each other blocks, and due to their tapered form and the taper of the walls of the block openings, the bushings will form a tight wedging engagement between the cutter shaft and the blocks.

within the openings in the It will be seen from the foregoing that a means has been provided whereby a reamer cutter may be mounted in a reamer body in such a manner that jolts, jars and vibrations incident to the operation of the reamer will not be able to dislocate or loosen the reamer cutter from its po- 5 sition on the body. Due to the manner of sesaid major recess, and to form a tight wedging curing the blocks, this obviously will in all cases engagement between said shaft and said blocks. prevent the blocks from becoming loosened in 4. In a reamer construction, a reamer body their recesses, providing a permanently tight having a ma or recess in its outer surface and a though, When s y, a eadily detachable smaller auxiliary recess at each end of said major mounting for the reamer cutter. recess, a block fixedly secured in each of said I claim: auxiliary recesses having an opening there- 10 smaller auxiliary recess at each end of said major spondingly tapered split bushing in each of said recess, a block in each of said auxiliary recesses blocks, a reamer cutter in said major recess, a hav Opening et h tapering o a cutter shaft extending through said split busha smaller dimension in a direction toward said ings and means for drawing said split bushings major re a orr spondingly tapered split tightly within the tapered openings and toward l5 bushing in each of said blocks, a reamer cutter h ther into proper position to rotatably ings, and nuts on said threaded extremities shaft and -b k adapted to be tightened to draw said split bush- 5, In a reamer construction, a reamer body 1 20 ings t y Within the p ed Openings and into having a major recess in its outer surface and a prop pos 110 rotatably mount Said cutter in smaller auxiliary recess at each. end of said major said major recess. recess, each of said auxiliary-recesses being of a reamel Construction, a leamer body the same iateral and longitudinal dimensions having a major recess in its outer surface and a throughout block fixedly Secured in each of 1 a; smaller auxiliary recess at each end of said major Said auxiliary recesses having an Opening there recess, a b oc fixedly Secured each of said through tapering toward a smaller dimension in auXil 'a y recesses having Opening there" a direction toward said major recess, a correthlOugh toward a Smaller dimensiOn 1'11 tapered bushing each f .sa j d a direction towa d S major recess a Corre" looks, a reamer cutter in said major recess, a

draw said Split bushings Within the tar form a wedgjng engagement between said nered openings and toward each other into proper haft and said k position to rotatab-ly mount said cutter in saidi In a regmer construction, l'eamer body having a major recess in its outer surface and 3.'In a reamer cons ru a reamel body a smaller auxiliary recess at each end of said 40,; ha n a maj recess n its Outer Surface major recess, a block fixedly secured in each of' a smaller auxiliary rece at each end of Said said auxiliary recesses having an opening therespondingly tapered split bushing i e f Said said blocks respectively, and extending through l k a n r cutter In d m i r r a said major recess, a reamer cuftter' rotatably cutter shaft threaded at its extremities extendo nt d about said pin within. said major recess,

in hrou h said split bushings, and means on and means for forcing said split bushings tightly- 50; said threaded extremities adapted to be tightened Within t tapered openings and toward each ep r d p n n an toward ch o her i tween said reamer in ends and said blocks. 1 proper position to rotatably mount said cutter in DWIGHT D. ANDERSON. 

